does the main fuse on a s4 tii have to be an 80a i tried a 100a off of a s5 but no work

 

you do not want to use any fuse higher or lower than the specified amperage. if you do, there is a chance you can catch your car on fire and burn it to the ground..maybe with you in it. dont take that chance.

at any rate, you need to see if that fuse port is getting power. test for voltage there and let us know the results.

 

A 100a would work, but you don't want to use it. What is your problem? It seems you have no power to something and changed the fuse to see what might happen.

 

my roommate replaced his alternator and touched one of the wires to something and burnt the main fuse tried just to replace that but no go

the weird thing was that with the fuse disconnected the power would still go to the car but not starter and nothing would work with it connected

 

so i figured a short and fiddled around with the wires couldn't find the one with short but now car starts fine any idea which wire i should check so it doesn't go out again

 

I don't have a specific idea, but next time you or anybody you're working with messes with auto electronics, disconnect the battery.

I cannot stress that enough, DISCONNECT THE BATTERY. The "wire" he touched to something was most likely raw voltage, a direct positive connection to the battery. It's easy to short that out, since nearly anything in the engine bay is a ground. Just please, for your sake, take out the battery next time.

 

yeah i berated him for a lil bit